I wouldn't pay too much. Yardsale and estate stuff goes very cheap around here. Usually for $1-5 a plastic grocery bag, and you can stuff a lot of fabric in one of those if you try. Sellers who try to get more money are usually left with it. No one is going to pay anything close to retail for all that, when you have to wash/dry/iron it all, and sometimes find out after you get it home that it smells musty. I think most people would rather buy new fabric for close to new fabric prices, than someone else's stash.